fix(logger): remove Source and Tag from output

An application's logs should not contain which host it was listed
on. It should only care about the data that is relevant to it.

The Tag field is unused, so this added an extra whitespace to the
log format. Removing it cleans up the logs a bit.

Author: Matthew Fisher

logger/syslog/message.go

@@ -36,8 +36,9 @@ func (m *Message) NetSrc() string {
 func (m *Message) String() string {
 	timeLayout := "2006-01-02 15:04:05"
 	return fmt.Sprintf(
-		"%s %s %s %s%s",
-		m.Time.Format(timeLayout), m.Source,
-		m.Hostname, m.Tag, m.Content,
+		"%s %s %s",
+		m.Time.Format(timeLayout),
+		m.Hostname,
+		m.Content,
 	)
 }